Comment on: Constraints on the depth and variability of the lunar regolith, by B. B. Wilcox, M. S. Robinson, P. C. Thomas, and B. R. Hawke

Any permanent presence on the Moon will require use of materials from the lunar regolith, the Surface soil layer oil the Moon. Thus, knowledge of the thickness of the lunar regolith is essential. It has been proposed that crater counts obtained from high Sun angle photography give larger estimates of impact crater equilibrium diameters than for low Sun angle photography, and thus deeper estimates of lunar surface regolith than were previously made using crater morphology, size of blocky rimmed craters, and equilibrium diameters determined on low Sun angle images. The purpose of this comment is to evaluate this result as a means of resolving this important question before planning for future lunar missions is undertaken.